XR21V1410 Datasheet, PDF (3/23 Pages) Exar Corporation – 1-CH FULL-SPEED USB UART

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PIN DESCRIPTIONS
Pin Description
NAME
16-QFN
PIN #
UART Signals
RX
10
TX
9
GPIO0/RI#
8
GPIO1/CD#
7
GPIO2/DSR#
6
GPIO3/DTR#
5
GPIO4/CTS#
4
GPIO5/RTS#
3
USB Interface Signals
USBD+
15
USBD-
14
I2C Interface Signals
SDA
11
XR21V1410
1-CH FULL-SPEED USB UART
TYPE
DESCRIPTION
I
UART Channel A Receive Data or IR Receive Data. This pin has an
internal pull-up resistor. Internal pull-up resistor is not disabled during
suspend mode.
O
UART Channel A Transmit Data or IR Transmit Data.
I/O _{General purpose I/O or UART Ring-Indicator input (active low). This pin}
has an internal pull-up resistor. Internal pull-up resistor is disabled during
suspend mode. If using this GPIO as an input, a pull-up resistor is
required to minimize the power consumption in the suspend mode.
I/O _{General purpose I/O or UART Carrier-Detect input (active low). This pin}
has an internal pull-up resistor. Internal pull-up resistor is disabled during
suspend mode. If using this GPIO as an input, a pull-up resistor is
required to minimize the power consumption in the suspend mode.
I/O _{General purpose I/O or UART Data-Set-Ready input (active low). This}
pin has an internal pull-up resistor. Internal pull-up resistor is disabled
during suspend mode. If using this GPIO as an input, a pull-up resistor
is required to minimize the power consumption in the suspend mode.
I/O _{General purpose I/O or UART Data-Terminal-Ready output (active low).}
This pin has an internal pull-up resistor. Internal pull-up resistor is dis-
abled during suspend mode. If using this GPIO as an input, a pull-up
resistor is required to minimize the power consumption in the suspend
mode.
I/O _{General purpose I/O or UART Clear-to-Send input (active low). This pin}
has an internal pull-up resistor. Internal pull-up resistor is disabled during
suspend mode. If using this GPIO as an input, a pull-up resistor is
required to minimize the power consumption in the suspend mode.
I/O _{General purpose I/O or UART Request-to-Send output (active low). This}
pin has an internal pull-up resistor. Internal pull-up resistor is disabled
during suspend mode. If using this GPIO as an input, a pull-up resistor
is required to minimize the power consumption in the suspend mode.
I/O _{USB port differential data plus. This pin has a 1.5 K Ohm internal pull-up}
resistor.
I/O _{USB port differential data minus.}
OD _I2_{C-controller data input/output (open-drain). 1K pull-up resistor is}
required. An optional external I²C EEPROM can be used to store
default configurations upon power-up including the USB Vendor ID and
Device ID.
If an EEPROM is not used, this pin can be used with the SCL pin to
select the Remote Wake-up and Power modes. An external pull-up or
pull-down resistor is required. See Table 1
3